feat: Init of Tauri application with system tray support and configuration

- Added main.rs to set up the Tauri application with a system tray.
- Implemented a basic application state management using Mutex.
- Created a system tray menu with options for "Settings" and "Quit".
- Configured tauri.conf.json with application metadata and window settings.

.gitignore

@@ -0,0 +1,17 @@
+# Rust / Tauri
+/src-tauri/target/
+/target/
+**/*.rs.bk
+
+# OS
+.DS_Store
+Thumbs.db
+
+# VS Code
+.vscode/
+!.vscode/launch.json
+!.vscode/tasks.json
+
+# Node / Frontend (om det läggs till senare)
+node_modules/
+/dist/